U.S. airstrikes targeting an oil port held by Yemen’s Houthi rebels killed 38 people and wounded 102 others, the group said Friday, marking the single-deadliest known attack under President Donald Trump’s new campaign targeting the rebels.

Ras Isa is a critical oil pipeline and port, one of three on the country’s west coast through which the vast majority of imports and humanitarian assistance enter Yemen. Central Command argued the Iran-backed Houthi rebels, which America considers a terrorist group, were using the site as a fuel supply facility and for graft.

US airstrikes on an oil port in western Yemen have killed at least 38 people, Houthi-run Al-Masirah TV reported Friday, marking one of the deadliest days since the United States escalated its aerial military campaign against the Iranian-backed group in recent weeks.